CuAPSO-34 catalysts for N_2O decomposition in the presence of H_2O. A study of zeolitic structure stability in comparison to Cu-SAPO-34 and Cu-ZSM-5

摘要

The structural stability at high temperatures of both Cu-exchanged SAPO-34 and CuAPSO-34 with isomorphously substituted copper ions has been investigated. SAPO-34 undergoes an extensive crystallinity loss upon copper ion exchange. The CuAPSO-34 framework showed good hydrothermal stability, as reflected in its surface area and X-ray diffraction pattern after ageing treatments. This catalyst exhibited good activity in N_2O decomposition even when the reaction was run in the presence of H_2O or after ageing treatment under H_2O vapor at 600 deg C for 80 h which, conversely, led to a drastic loss of activity of Cu-ZSM-5.